After playing with Bios (re-enabling mass storage via USB) connecting directly via one hub and consolidating (flaky) power outlet resolved the issue. zfs list displayed upall sets. (-:
Axel > Am 14.06.2020 um 13:15 schrieb Axel Rau <axel....@chaos1.de>: > > After installing the recent update to 12.1-RELEASE-p6 via freebsd-update, our > USB backup device is no longer recognized. This USB 3.x device (Seagate > serial NA9QFX4L) was never recognized by FreeBSD. > To get it to work, we used the integrated hub of another seagate disk (serial > NA7DQ4JJ) which worked until now. >
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